189438389 has 4 divisors (see below), whose sum is σ = 216501024. Its totient is φ = 162375756.

The previous prime is 189438383. The next prime is 189438391. The reversal of 189438389 is 983834981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 189438389 - 2²⁰ = 188389813 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 189438389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189438383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13531307 + ... + 13531320.

It is an arithmetic number, because the mean of its divisors is an integer number (54125256).

Almost surely, 2^189438389 is an apocalyptic number.

It is an amenable number.

189438389 is a deficient number, since it is larger than the sum of its proper divisors (27062635).

189438389 is an equidigital number, since it uses as much as digits as its factorization.

189438389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27062634.

The product of its digits is 1492992, while the sum is 53.

The square root of 189438389 is about 13763.6619037232. The cubic root of 189438389 is about 574.3227201405.

The spelling of 189438389 in words is "one hundred eighty-nine million, four hundred thirty-eight thousand, three hundred eighty-nine".